660563273 has 2 divisors, whose sum is σ = 660563274. Its totient is φ = 660563272.

The previous prime is 660563263. The next prime is 660563303. The reversal of 660563273 is 372365066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657563449 + 2999824 = 25643^2 + 1732^2 .

It is a cyclic number.

It is not a de Polignac number, because 660563273 - 2⁶ = 660563209 is a prime.

It is not a weakly prime, because it can be changed into another prime (660563263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330281636 + 330281637.

It is an arithmetic number, because the mean of its divisors is an integer number (330281637).

Almost surely, 2^660563273 is an apocalyptic number.

It is an amenable number.

660563273 is a deficient number, since it is larger than the sum of its proper divisors (1).

660563273 is an equidigital number, since it uses as much as digits as its factorization.

660563273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 38.

The square root of 660563273 is about 25701.4255052127. The cubic root of 660563273 is about 870.9063848386.

The spelling of 660563273 in words is "six hundred sixty million, five hundred sixty-three thousand, two hundred seventy-three".